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2 definitions found

From: Webster's Revised Unabridged Dictionary (1913)

 Ret·i·nal a. Anat. Of or pertaining to the retina.
 Retinal purple Physiol. Chem., the visual purple.
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From: WordNet (r) 2.0

 retinal purple
      n : a red photopigment in the retinal rods of vertebrates;
          dissociates into retinene by light [syn: visual purple,
           rhodopsin]